(Solved): [TASK 1] Figure 1. 33kV Feeder Over Current Protection - Overload Factor: 120\%. - Time Over Curre ...

[TASK 1] Figure 1. 33kV Feeder Over Current Protection - Overload Factor: 120\%. - Time Over Current Curve: IEC Standard Inverse. - Relay Current Pickup Range: 0.1-2.0A (0.1A step). - Time Over Current TMS Range: \( 0.1-1.0 \) (0.1 step). - TMS setting for R2 is 0.1. - Time over current pickup for R1 is \( 120 \% \) of CT secondary current. - Time Over Current Coordination time \( \Delta t: 0.5 \) seconds. - High-set (Definite Time) Setting for R1 and R2: 80\% of Short Circuit Current (IsC). - High-set (Definite Time) Over Current Pickup Range: 1 - 15A. - High-set (Definite Time) Set-point: R1-0.2s, R2-0.1 s a) Calculate Load Current, Time Overcurrent and High-set Pickup value for R2. [5 marks] b) Calculate Time Overcurrent pickup, TMS, and High-set Pickup value for R1. [5 marks] [TASK 2] a) Construct the power system model of TASK 1 in ETAP and run "Load Flow". - Attach the snapshot of load flow result with the current value. [3 marks] b) Run "Short-Circuit" Analysis on all the buses. - Attach the snapshot of the short circuit result with the current value. [5 marks] c) Configure the overcurrent protection using "Star Protection \& Coordination" based on the parameters from TASK \( 1 . \) - Attach the snapshot of "Star View". [7 marks] [Hint] - In "Power Grid - Short Circuit" Tap, "MVAsc" is 143 MVAsc \( (\sqrt{3} * 33 \mathrm{kV} * 2500 \mathrm{~A}) \) and "X/R" is 30 . - Select the correct CB and Cable from the library. (consider the rated voltage and load current.) - The lengh of the cable - Between Bus 1 and 2: \( 15 \mathrm{~km} \) - Between Bus 2 and 3: \( 5 \mathrm{~km} \) - In "Load", it assumes "\%PF" is 100 . - Use "GE Multilin 750/760" protection relay in the library. - In this case, disable "Neutral", "Ground" and "Sen. Ground" protections. (Only "Phase" protection is valid.) - Note: The fault current level can be slightly different due to the various cable types.